Getting a "Could not find a base address that matches scheme net.tcp"

Question

I've written several WCF services which use HTTP (and its variants).  Now I'm trying to learn how to write a WCF service which will use TCP.  I'm using Andrew Troelsen's book, "Pro C# 2008 and the .NET 3.5 Platform" as a guide (chapter 25).  I've asked questions related to this before on a much more complicated WCF service, so I decided to write a simple WCF service to learn how to do it, rather than work on my more complicated WCF service.  Coincidentally I chose the same routine as Troelsen did in his book, although in my case I called the WCF service SimpleAdd.
Anyway, after writing the WCF service, I then wrote the Windows Service to host it.  I then installed it, and the installation went fine.  When I tried to run the service, the service started but then immediately stopped.  I checked the event log and found the following message in it:
"Service cannot be started. System.InvalidOperationException: Could not find a base address that matches scheme net.tcp for the endpoint with binding MetadataExchangeTcpBinding. Registered base address schemes are [http]."
Here's the interface code for my SimpleAdd:
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Runtime.Serialization;  
using System.ServiceModel;  
using System.Text;  
namespace SimpleAdd  
    // NOTE: If you change the interface name "IService" here, you must also update the reference to "IService" in App.config.  
    [ServiceContract]  
    public interface IService  
        [OperationContract]  
        int Add(int FirstNumber, int SecondNumber);  
Here's the code for the implementation (I'm leaving out the using statements):
namespace SimpleAdd  
    // NOTE: If you change the class name "Service" here, you must also update the reference to "Service" in App.config.  
    public class Service : IService  
        #region IService Members  
        int IService.Add(int FirstNumber, int SecondNumber)  
            return (FirstNumber + SecondNumber);  
        #endregion  
And here's the App.Config file for the service:
<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
  <system.web> 
    <compilation debug="true" /> 
  </system.web> 
  <!-- When deploying the service library project, the content of the config file must be added to the host's   
  app.config file. System.Configuration does not support config files for libraries. --> 
  <system.serviceModel> 
    <services> 
      <service behaviorConfiguration="SimpleAdd.ServiceBehavior" name="SimpleAdd.Service">  
        <clear /> 
        <endpoint binding="wsHttpBinding" contract="SimpleAdd.IService" 
          listenUriMode="Explicit">  
          <identity> 
            <dns value="localhost" /> 
            <certificateReference storeName="My" storeLocation="LocalMachine" 
              x509FindType="FindBySubjectDistinguishedName" /> 
          </identity> 
        </endpoint> 
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" 
          listenUriMode="Explicit">  
          <identity> 
                        <!--   
            <certificateReference storeName="My" storeLocation="LocalMachine" 
              x509FindType="FindBySubjectDistinguishedName" /> 
                            --> 
          </identity> 
        </endpoint> 
        <endpoint address="net.tcp://localhost/SimpleAdd/" binding="netTcpBinding" 
          bindingConfiguration="" contract="SimpleAdd.IService" /> 
        <host> 
          <baseAddresses> 
            <add baseAddress="http://localhost:8731/Design_Time_Addresses/SimpleAdd/Service/" /> 
          </baseAddresses> 
        </host> 
      </service> 
    </services> 
    <behaviors> 
      <serviceBehaviors> 
        <behavior name="SimpleAdd.ServiceBehavior">  
          <serviceMetadata httpGetEnabled="true" /> 
          <serviceDebug includeExceptionDetailInFaults="false" /> 
        </behavior> 
      </serviceBehaviors> 
    </behaviors> 
  </system.serviceModel> 
</configuration> 
I don't think it will matter much, because I believe the problem probably lies in the App.config file for the Windows service, but just in case, here's the code for the AddWinService (without the using statements):
namespace WindowsAddService  
    public partial class AddWinService : ServiceBase  
        //A member variable of type ServiceHost.  (I'm using the "Pro C# 2008" book as reference for this.)  
        private ServiceHost myHost;  
        public AddWinService()  
            InitializeComponent();  
        protected override void OnStart(string[] args)  
            //just to be really safe  
            if (myHost != null)  
                myHost.Close();  
                myHost = null;  
            //create the host  
            myHost = new ServiceHost(typeof(SimpleAdd.Service));    //I've included the class from SimpleAdd, which isn't in the book!!!  
            //open the host  
            myHost.Open();  
        protected override void OnStop()  
            //shut down the host  
            if (myHost != null)  
                myHost.Close();  
And lastly, here is the App.Config file from my AddWinService:
<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
    <system.serviceModel> 
        <client> 
            <endpoint address="net.tcp://localhost/SimpleAdd" 
                                binding="netTcpBinding" 
                                contract="SimpleAdd.IService" 
                                name="netTcpBinding_IService" /> 
        </client> 
        <services> 
            <service name="SimpleAdd.Service" 
                             behaviorConfiguration="SimpleAddMEXBehavior">  
                <!-- Enable the MEX endpoint --> 
                <endpoint address="mex" 
                                    binding="mexTcpBinding" 
                                    contract="IMetadataExchange" /> 
                <host> 
                    <!-- Need to add this so MEX knows the address of our service. --> 
                    <baseAddresses> 
                        <add baseAddress="http://localhost:8731/Design_Time_Addresses/SimpleAdd/Service/" /> 
                    </baseAddresses> 
                </host> 
            </service> 
        </services> 
        <behaviors> 
            <serviceBehaviors> 
                <behavior name="SimpleAddMEXBehavior">  
                    <serviceMetadata httpGetEnabled="true" /> 
                </behavior> 
            </serviceBehaviors> 
        </behaviors> 
    </system.serviceModel> 
</configuration> 
So, where have I gone wrong?
Rod

Answer 1

Hello Richard,
Well, I've tried making the change to the MEX point for net.tcp, but now when I try to start the service I get the following error in the event log:
Service cannot be started. System.InvalidOperationException: Service 'SimpleAdd.Service' has zero application (non-infrastructure) endpoints. This might be because no configuration file was found for your application, or because no service element matching the service name could be found in the configuration file, or because no endpoints were defined in the service element.
I am sure the problem lies with what I've put into the app.config file.  My app.config file now looks like this:
<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
    <system.serviceModel> 
        <client> 
            <endpoint address="" 
                                binding="netTcpBinding" 
                                contract="SimpleAdd.IService" 
                                name="netTcpBinding_IService" /> 
        </client> 
        <services> 
            <service name="SimpleAdd.Service" 
                             behaviorConfiguration="SimpleAddMEXBehavior">  
                <!-- Enable the MEX endpoint --> 
                <endpoint address="mex" 
                                    binding="mexTcpBinding" 
                                    contract="IMetadataExchange" /> 
                <host> 
                    <!-- Need to add this so MEX knows the address of our service. --> 
                    <baseAddresses> 
                        <add baseAddress="net.tcp://localhost/SimpleAdd" /> 
                    </baseAddresses> 
                </host> 
            </service> 
        </services> 
        <behaviors> 
            <serviceBehaviors> 
                <behavior name="SimpleAddMEXBehavior">  
                    <serviceMetadata httpGetEnabled="false" /> 
                </behavior> 
            </serviceBehaviors> 
        </behaviors> 
    </system.serviceModel> 
</configuration> 
I've also tried using this for the <client> tag under <system.serviceModel>:
<client> 
   <endpoint address="net.tcp://localhost/SimpleAdd" 
         binding="netTcpBinding" 
    contract="SimpleAdd.IService" 
    name="netTcpBinding_IService" /> 
</client> 
But that gives me the same error in the event log.
So, what have I done wrong now?
Rod